Expansion valve



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May 15, 1923.

' Patented ay 15,

I a citizen of the United States, residin EDWARD B. DE LUIZ, OF DETROIT,MICHIGAN, ASSIGNOR T0 KELVINATOR' CORPORA- TION, OF DETROIT, MICHIGAN,A. CORPORATION OF DELAWARE.

EXPANSION VALVE.

Application filed June 1, 1920. Serial No. 385,501.

To all whom it may concern:

Be it known that-I, EDWARD R. DE Lmz, at Detroit, in the county of Wayneand tate of Michi an, have invented a certain new and use 111Improvement in Expansion Valves, of which the following is a full,

clear, and exact description, reference being had to the accompanyingdrawings.

This invention relates to refrigerating a paratus and has especialreference to t 6 pressure reducing valve or expansion valve employed foradmitting the refrigerant( liquid into the expansion chamber at thenecessary rate for efiicient refrigeration The objects of the inventionare the provision of a device of this character which shall be simple,efficient, noiseless, leak roof, readily assembled and easily adjustethe provision of a device of this character containing a straining orfiltering cell which shall offer the maximum ossible filtering area andbe proof against c ogging and also easily cleaned; while further objectsand advantages of this invention will become ap parent as thedescription proceeds.

in the drawings accompanyin and forming a part of this application, llave shown certain embodiments of my invention although without intent torestrict myself to the particular physical forms therein delineated. Inthis drawing, Fig. 1 is a central sentional view through my preferredconstruction of valve; Fig. 2 represents a front elevation of the deviceshown inFig.

1; and Fig. 3 illustrates the device in opera= tive position relativelyto the expansion coil with which it is used.

l have shown my improved valve as employed in connection with the exansion coil and brine tank set forth in the opeland et all. application,filed January 14:, 1918,'Ser.-

No. 211,753 and in the Copeland applicatio filed Qctober 1919, Ser. No,332,907, al though without intending to restrict myself to such useexcepting as specifically set forth in my claims. This coil comprises aninitial part l into which refrigerant is first alt ted and a terminalput 2 from which the spent refrigerant passes to the return-pipe Thepart 1 is preferably iersed in a brine tank i and the expansion valve isattached to the upturned end 5 of this part, fresh refrigerant underpressure being delivered to the valve by the pipe My improved valvecomprises ahollo w casing 10 having at its rearward end the screwthreaded opening 11" and at its forward end the flaring circular web 12ter minated by the circular rim 13. The portions 10 and 12 are hollowedout to form a valve chamber and a diaphragm chamber respectively,suchchambers being separated by a partition 14 formed with an axialopening 15. The lower part of, the casing is formed with two independentdepending passageways 16 "and 17, which communicate with thevalve-chamber and diaphragm chamber, respectively. The passageway 17leads to the pipe connection 18 to whichthe expansion coil is attached,and the side of the passageway 16 is formed with the pipe connection 19'to which the refrigerant pipe 6 is connected.

The passageway 16 is preferably enlarged at a point between its ends toform a sediment chamber, and opens into the valve chamber through atapered opening 20, while its outer end is closed by means of the screwplug 21. Located inside this sediment chamber is a filter cell,preferably comprising a pair of spaced heads 23'24 connected by an axialpost 25 and by an external 0 lin- A 27 l he plug 21 carries a suitablespring 28 which presses against the opposite hea and holds the cell inplace. Any sediment is deposited on the exterior of the screen andeither falls to the bottom of the chamher or can be readily cleaned ofi'by removing the cell.

To the rim 13 is bolted the companion rim 30 of a cover plate 31 whosecenter is formed with an internally threaded cylindrical barrel 32coaxial with the aperture 15. Between the rims the flexible diaphragm 33is her-. metically clamped. The inner face of the plate 31 is formedwith a shallow circular recess 34 loosely receiving the wear plate 35whose center is provided with a boss 36 emlldil braced by one end of thehelical spring 37 whose opposite end rests against the adjustable plug38- which is screwed inside the barrel 32. @utside of this plug l haveEMS ing portion cooperating with said aperture. At its forward end thisstem rests loosely against a wear plate 44 which in turn rests againstthe face of the diaphragm and is held against displacement by suitablenotched fingers 45 which project from the partition 1d. At its rearwardend the valve is engaged by a helical spring 47 whose opposite end restsagainst the plug 48 which closes the opening ll. The springs 37 and 4?therefore act in opposite directions, one tending to close the valve andthe other to open the same, while their relative eflect is adjusted by'moving the plug 38, which can be efiected without securing access totherefrigerant side of the diaphragm and without danger of producingleakage.

Having thus described my invention, what I claim is z--- 1. In apressure reducing valve, a casing having therein an elongated valvechamber and a diaphra chamber, a partition between said chambers andhaving an aperture therein, said casing also having a passageway leadingdownwardly from each of said chambers, the passageway which communicateswith the diaphragm chamber constituting an outlet and the otherpassageway constituting a filtering chamber, removable closures for saidvalve chamber and filtering chamber, a filtering cell comprising a pairof spaced heads and a screen connecting them, one of said heads beingaperturedand seated in the orifice which establishes communicationbetween said last mentioned chambers, means including the closure ofsaid filtering chamber for holding said cell in place, the wall of saidfiltering chamber being formed with an inlet opening, a valve in saidvalve chamber adapted to close said first aperture, and having a stemprojecting through that aperture, a spring -for closing said valve, adiaphragm traversing said dia phragm chamber and adapted when deflectedto displace said stem, a cover plate on the opposite side of saiddiaphragm from said casing, and an adjustable spring carried by saidcover plate and tending to move said diaphra against the tension of saidfirst spring. I

2. In a pressure regulating valve a casing having a valve chamber and adiaphragm chamber, a partition between said chambers and having anaperture therein, said aperture being located at the center of saiddiaphra chamber, a plurality of fingers carried by said partition andhaving notches in their outer faces, a late loosely located in saidnotches, a diap ragm traversing said chamber and passing close to saidplate, a

cover plate havinga rim secured to the rim of said diaphragm chamber andclamping said diaphr 1 a the face of said plate which overlies saiddiaphragm having a. circular cavity, a circular plate loosely receivedin intense said cavity and pressing against said diaphragm, said coverplate having an internally threaded barrel in line with said aperture,an adjustable plug screwed in said barrel, a spring interposed betweensaid plug and said last mentioned plate, a valve memher in said valvechamber and having a stem projecting through said aperture into engagement with said first mentioned plate, and a spring in said valvechamber pressing said valve member-towards said diaphragm.

3. In a pressure regulating valve, a casing having therein a horizontalvalve chamber and a depending chamber communicating therewith through anarrowed orifice, a cover plate secured to the end of said casing anddefining therewith a circular diaphragm chamber coaxial with said valvechamber, said casin having an inlet opening in the side of said secondchamber and an outlet opening in the side of said diaphragm chamber andthe ends of said inlet chamber and valve chamber being termed for thereception of closure devices, a filter cell located in said secondchamber and having a pair of spaced heads surrounded by ascreen, one ofsaid heads being apertured and received tightly in'said orifice, adiaphragm traversing'said diaphragm chamber, a valve member in saidvalve chamber and having a stem projecting into said diaphragm chamber,and spring means cooperating with said diaphragm for operating saidvalve.

d. In a pressure regulating valve, a casing having a sediment chamber, avalve chamher, and a diaphragm chamber, partitions between saidchambers, said valve chamber communicating with each of the other chainhers through apertures in said partitions, a

filter cell in said sediment chamber and.

located in the aperture which leads to the valve chamber, a valve memberin the valve chamber and having a stem projecting through the aperturewhich leads to the diaphragm chamber and a diaphragm in said diaphragmchamber and operatively associated with said stem, the aperture whichleads from said sediment chamber to said valve chamber being located inthe upper part of said sediment chamber and said sedi= ment chamber alsohaving an inlet connection located at a point above its bottom.

5. In a pressure regulating valve, a casing having therein a. horizontalvalve chamber and a depending chamber communicating therewith through anarrowed orifice, a filter cell locatedin said second chamber and havinga pair of spaced heads, surrounded by a screen, one of said heads beingapertured and received tightly in said orifice, a

post connecting said heads inside said screen,

' 6. In a pressure regulating valve, for refrigerating apparatus, acasing having a valve chamber and a diaphragm chamber, a diaphragmlocated in said diaphragm chamber, a partition between said chambers andhaving an aperture therein, a valve member in said valve chamber havinga seating portion adapted to close said aperture and a stem whichextends into operative relation with said diaphragm, sprin means in saidvalve chamber tending to (dose said valve, spring means upon theopposite side of the diaphragm tending to open said valve, means forsupporting said casing with said valve stem in a substantial horizontalposition, said casing having a depending pocket communicating with saidvalve chamber, a

filtering cellin said pocket, an inlet pipecommunicating with saidpocket above the bottom thereof, and an outlet pipe communieating withthe lowest point of said dia phragm chamber.

7. n refrigerating-apparatus, in combination, an expansion coil, .and apressure regulating "valve comprising a casing having a valve chamberand a dlaphragm chamber,

-a diaphragm located in said diaphragm chamber, a partition between saidchambers and having an aperture therein, a valve member in said valvechamber having a seating portion adapted to close said aperture and astem which extends into operative relation with said diaphragm, springmeans in said valve chamber tending to close said valve, spring meansupon the opposite side of said diaphragm tending to open said valve,means suppprting said, cas1ng-with and an inlet passage way! leadingupwardly I into said valve chamber.

8. In refrigeratmg ap aratus, m combinatlon, an expansion 001 having adownwardly extending inlet connection, an e'xpansi'on valve secured tosaid inlet connection and comprising a casing having therein ;adiaphragm chamber and a valve chamber and an apertured partitionbetween, said.

chambers, a diaphragm located in said diaphragm chamber, a valve memberin said valve chamber having a seating portion I adapted tov close theaperture and a stem.

which extends into operative relation to said diaphragm, spring (meanstending to close said valve, spring means tending to move said diaphragmina direction to open said valve, said valve stem being substantiallyhorizontal and the connection to said expansion. coil communicating withthe lowest part of said diaphragm chamber, said caseing also having awell located beneath and communicating with said valve chamber and "aninlet connection communication with well at a point above its bottom.

In testimony whereof, I hereuntoaflix signature.

' EDWARD 3.1312 LUI-z. I

